PHP MYSQL Next AND Previous row - php

Question

Basically I have a table with data, and I have a form with boxes and stuff, and what I am trying to do is when the I click on the next or previous button, it will take the next record from the database. I can do the first and the last record, but I cant manage to figure the in between. this what I have.
$sql="SELECT * FROM Emails where ID > 1 ORDER BY UserEmail LIMIT 1";
if ($result=mysqli_query($connection,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
while( $row = mysqli_fetch_array( $result ) )
{
$Email_Field = $row['UserEmail']; //primary key
$Name_Field = $row['UserName'];
$UserTel = $row['UserTel'];
$Drop_Down = $row['Drop_down'];
$MessageType = $row['MessageType'];
$Comments = $row['Comments'];
$SubjectOther = $row['SubjectOther'];
$Check = $row['Request'];
}
<form method="POST" action="Controller_leads.php">
<p><strong>What kind of comment would you like to send?</strong></p>
<input type="radio" <?php if ($MessageType == "Complaint") echo "checked"; ?> name="MessageType" value="Complaint">Complaint
<input type="radio" <?php if ($MessageType == "Problem") echo "checked"; ?> name="MessageType" value="Problem">Problem
<input type="radio" <?php if ($MessageType == "Suggestion") echo "checked"; ?> name="MessageType" value="Suggestion">Suggestion
<br>
<p><strong>What about us do you want to comment on?</strong></p>
<select name="Drop_Down" size="1">
<option value ="Web Site" <?php if ($Drop_Down == "Web Site") echo selected ?>>Web Site</option>
<option value ="Office Hours" <?php if ($Drop_Down == "Office hours") echo selected ?>>Office Hours</option>
<option value ="Pamphlet" <?php if ($Drop_Down == "Pamphlet") echo selected ?>>Pamphlet</option>
</select>
Other: <input type="text" size="26" maxlength="256" name="SubjectOther" value="<?php echo $SubjectOther ?>">
<p><strong>Enter your comments in the space provided below:</strong></p>
<textarea name="Comments" rows="5" cols="42"><?php echo $Comments;?></textarea><br><br>
<strong>Tell us how to get in touch with you:</strong><br><br>
<table>
<tr><td width="45"> Name </td> <td><input type="text" size="35" maxlength="256" name="UserName" value="<?php echo $Name_Field ?> "></td></tr>
<tr><td width="45"> E-mail </td> <td><input type="text" size="35" maxlength="256" name="UserEmail" value="<?php echo $Email_Field ?>"></td></tr>
<tr><td width="45"> Telephone</td> <td><input type="text" size="35" maxlength="256" name="UserTel" value="<?php echo $UserTel ?>"></td></tr>
</table>
<br>
<input type="checkbox" name="Check" <?php if ($Check == "Contact Requested") echo checked; ?> value="Contact Requested">Please contact me as soon as possible regarding this matter
<br><br>
<input type="submit" value="First" name="first">
<input type="submit" value="Next" name="next">
<input type="submit" value="Previous" name="previous">
<input type="submit" value="Last" name="last"> code here

Answer 1

Try adding an offset to the query. On each next click add one to $offset, on each previous, subtract one from offset. Then, include offset in the query like this:
# get the current offset
# initial value
$offset = 1;
# if we have an offset from a previous or next click, use that
if (isset($_POST['offset'])) {
# validate this input to protect against sql injection
if (is_int($_POST['offset'])) {
$offset = $_POST['offset'];
}
# now that we have our current value, see if we need to get the next or previous
if ($_POST['submit']=="Next") {
# next, add one offset
$offset++;
} else if ($_POST['submit']=="Previous") {
# previous, go back one if we are greater than one
if ($offset > 1) {
$offset--;
}
}
}
# query time, give me one result (LIMIT 1), staring at record $offset
$sql = "select SELECT * FROM Emails where UserEmail > 1
ORDER BY UserEmail LIMIT 1, $offset";
In your form add this:
<input type="hidden" name="offset" value="<?php echo $offset; ?>">
On a different note, UserEmail > 1 seems weird, but I don't know your data.